Income Taxes (Summary of Operating Loss Carryforwards and Tax Credit Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	$ 7.0	$ 12.4
Total net deferred tax asset	7.0	12.4
Total valuation allowance	3.1	3.0
Foreign tax authority
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	0.4	0.4
Valuation allowance, net operating loss	0.4	0.4
Net deferred tax asset, tax credit		2.1
Valuation allowance, tax credit		0
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	4.7	4.9
Valuation allowance, net operating loss	2.7	2.6
Net deferred tax asset, tax credit	1.9	5.0
Valuation allowance, tax credit	$ 0	$ 0